Due to the fact that each cryptocurrency exchange platform has it's own set of shortcomings. The best we can actually do is to determine the flaws we can live with and those that simply won't work for us. When attempting to trade, the first and key thing I look out for is the security of the exchange platform. I go with platforms that give me peace of mind as I can't afford to loose my funds. Other factors besides security which I look out for include; privacy, liquidity, support, fees charged for trading and withdrawal. My advice is to always go with the most popular platforms if you do not intend to do a thorough research.